JP2017087134A - Maintenance method of column packed with activated carbon - Google Patents

Maintenance method of column packed with activated carbon Download PDF

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JP2017087134A
JP2017087134A JP2015220266A JP2015220266A JP2017087134A JP 2017087134 A JP2017087134 A JP 2017087134A JP 2015220266 A JP2015220266 A JP 2015220266A JP 2015220266 A JP2015220266 A JP 2015220266A JP 2017087134 A JP2017087134 A JP 2017087134A
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activated carbon
water
packed tower
oil
maintenance method
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JP6358232B2 (en
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正寛 新宮
Masahiro Shingu
正寛 新宮
二郎 早田
Jiro Hayata
二郎 早田
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Sumitomo Metal Mining Co Ltd
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Abstract

PROBLEM TO BE SOLVED: To provide a maintenance method of a column packed with activated carbon capable of shortening a time required for withdrawal of the activated carbon.SOLUTION: A maintenance method of a column 1 packed with activated carbon for adsorbing oil contained in a water to be treated includes a hot-water washing step for supplying hot water to the column 1 packed with activated carbon to wash the activated carbon and a withdrawal step for withdrawing the activated carbon from the column 1. The temperature of the hot water is set to lower viscosity of oil adsorbed by the activated carbon. Lowered viscosity of the oil adsorbed by the activated carbon enhances fluidity of the activated carbon and thus shortens a time required for withdrawal of the activated carbon.SELECTED DRAWING: Figure 1

Description

本発明は、活性炭充填塔のメンテナンス方法に関する。さらに詳しくは、交換時期に至った活性炭を交換するための活性炭充填塔のメンテナンス方法に関する。   The present invention relates to a maintenance method for an activated carbon packed tower. More specifically, the present invention relates to a method for maintaining an activated carbon packed tower for replacing activated carbon that has reached the replacement time.

ニッケルやコバルトなどの非鉄金属の湿式精錬では、溶媒抽出により不純物を除去することが行われる。溶媒抽出は、被処理液と有機溶媒とを混合した後に静置して、油相と水相とを密度差により分離することで行われる。被処理水は目的金属が含まれる水溶液であり、例えば硫酸ニッケル溶液、硫酸コバルト溶液、塩化ニッケル溶液、塩化コバルト溶液などである。溶媒抽出に用いられる装置としては、例えばミキサーセトラー型抽出装置が知られている。   In the wet refining of non-ferrous metals such as nickel and cobalt, impurities are removed by solvent extraction. The solvent extraction is performed by mixing the liquid to be treated and the organic solvent, and then leaving the mixture to separate the oil phase and the aqueous phase based on the density difference. The water to be treated is an aqueous solution containing a target metal, such as a nickel sulfate solution, a cobalt sulfate solution, a nickel chloride solution, or a cobalt chloride solution. As an apparatus used for solvent extraction, for example, a mixer-settler type extraction apparatus is known.

溶媒抽出装置から排出される油相のほとんどは有機溶媒であるため、繰り返し溶媒抽出に用いられる。一方、水相はほとんどが水であるが、分離されなかった少量の油分（有機溶媒）が混合された油分混合水である。そのため、水相を系外に排出する前に油分を除去する必要がある。   Since most of the oil phase discharged from the solvent extraction apparatus is an organic solvent, it is repeatedly used for solvent extraction. On the other hand, the water phase is mostly water, but is oil mixed water in which a small amount of oil (organic solvent) that has not been separated is mixed. Therefore, it is necessary to remove the oil before discharging the aqueous phase out of the system.

上記のような油分混合水から油分を除去するには、活性炭充填塔が用いられる（例えば、特許文献１）。油分混合水を活性炭充填塔に通液して、活性炭に油分を吸着させることで、油分を除去する。   An activated carbon packed tower is used to remove oil from the oil mixture water as described above (for example, Patent Document 1). Oil mixed water is passed through an activated carbon packed tower, and the oil is removed by adsorbing the oil on the activated carbon.

活性炭には寿命があり、油分を吸着しつづけると吸着能力が低下する。活性炭の吸着能力が低下した場合には、活性炭を新しいものに交換して、吸着能力を回復させる作業が行われる。   Activated carbon has a lifetime, and if it continues to adsorb oil, the adsorption capacity will decrease. When the adsorption capacity of activated carbon decreases, the activated carbon is replaced with a new one, and the work of restoring the adsorption capacity is performed.

特開２０１４−１２４５３９号公報JP 2014-124539 A

しかし、油分を吸着した活性炭は粘性が増すため、活性炭充填塔から抜き出すのが困難である。そのため、活性炭充填塔から活性炭を抜き出す作業に６〜１２時間を要する。また、油分混合水の処理量が増加した場合には、さらに活性炭が抜き出しにくくなる。溶媒抽出に用いられる有機溶媒の種類によっても、活性炭が抜き出しにくくなる。このような場合、活性炭充填塔から活性炭を抜き出す作業に一日以上必要となる場合もある。   However, activated carbon that has adsorbed oil has increased viscosity and is difficult to extract from the activated carbon packed tower. Therefore, it takes 6 to 12 hours to extract the activated carbon from the activated carbon packed tower. Moreover, when the processing amount of oil mixed water increases, activated carbon becomes difficult to extract further. Depending on the type of organic solvent used for solvent extraction, it becomes difficult to extract activated carbon. In such a case, it may be necessary for more than a day to extract the activated carbon from the activated carbon packed tower.

本発明は上記事情に鑑み、活性炭の抜き出しに要する時間を短縮できる活性炭充填塔のメンテナンス方法を提供することを目的とする。   In view of the above circumstances, an object of the present invention is to provide a maintenance method for an activated carbon packed tower capable of shortening the time required for extracting activated carbon.

第１発明の活性炭充填塔のメンテナンス方法は、被処理水に含まれる油分を吸着する活性炭充填塔のメンテナンス方法であって、前記活性炭充填塔に温水を通液して活性炭を洗浄する温水洗浄工程と、前記温水洗浄工程の後に、前記活性炭充填塔から活性炭を抜き出す抜出工程と、を備えることを特徴とする。
第２発明の活性炭充填塔のメンテナンス方法は、第１発明において、前記温水の温度は、活性炭に吸着された油分の粘度が低下する温度であることを特徴とする。 The maintenance method of the activated carbon packed tower of the first invention is a maintenance method of the activated carbon packed tower that adsorbs oil contained in the water to be treated, and is a warm water washing step of washing the activated carbon by passing warm water through the activated carbon packed tower And an extraction step of extracting activated carbon from the activated carbon packed tower after the warm water washing step.
The maintenance method of the activated carbon packed tower of the second invention is characterized in that, in the first invention, the temperature of the hot water is a temperature at which the viscosity of the oil adsorbed on the activated carbon is lowered.

第１発明によれば、温水で洗浄することで、活性炭に吸着された油分の粘度が低下し、活性炭の流動性が高くなる。そのため、活性炭の抜き出しに要する時間を短縮できる。
第２発明によれば、温水で洗浄することで、活性炭に吸着された油分の粘度が低下する。 According to the first invention, by washing with warm water, the viscosity of the oil component adsorbed on the activated carbon decreases, and the fluidity of the activated carbon increases. Therefore, the time required for extracting activated carbon can be shortened.
According to 2nd invention, the viscosity of the oil component adsorbed by activated carbon falls by wash | cleaning with warm water.

活性炭充填塔の正面図である。It is a front view of an activated carbon packed tower.

つぎに、本発明の実施形態を図面に基づき説明する。
まず、活性炭充填塔の構成を説明する。
図１に示すように、活性炭充填塔１は円柱形の容器である。活性炭充填塔１の内部には活性炭が充填されており、活性炭により活性炭層１１が形成されている。 Next, an embodiment of the present invention will be described with reference to the drawings.
First, the configuration of the activated carbon packed tower will be described.
As shown in FIG. 1, the activated carbon packed tower 1 is a cylindrical container. The activated carbon packed tower 1 is filled with activated carbon, and an activated carbon layer 11 is formed of the activated carbon.

活性炭充填塔１の上部（活性炭層１１の上部空間）には供給口１２が設けられ、下部（活性炭層１１の下部空間）には排出口１３が設けられている。また、活性炭充填塔１の上部には活性炭投入口１４が設けられており、活性炭層１１の最下部に対応する位置には活性炭抜出口１５が設けられている。   A supply port 12 is provided in the upper part (upper space of the activated carbon layer 11) of the activated carbon packed tower 1, and a discharge port 13 is provided in the lower part (lower space of the activated carbon layer 11). In addition, an activated carbon charging port 14 is provided at the upper part of the activated carbon packed tower 1, and an activated carbon outlet 15 is provided at a position corresponding to the lowest part of the activated carbon layer 11.

被処理水は供給口１２から供給され、活性炭層１１において活性炭と接触する。活性炭層１１で処理された処理後水は排出口１３から排出される。   The water to be treated is supplied from the supply port 12 and contacts the activated carbon in the activated carbon layer 11. The treated water treated with the activated carbon layer 11 is discharged from the discharge port 13.

本実施形態において被処理水は油分混合水である。被処理水を活性炭充填塔１で処理することで、被処理水に含まれる油分を吸着除去する。油分混合水としては特に限定されないが、例えば溶媒抽出装置から排出された水相である。この水相には溶媒抽出装置で分離されなかった少量の油分（有機溶媒）が含まれている。この水相を活性炭充填塔１に通液することで、水相に含まれる微小油滴や水溶性の油分が吸着除去される。   In this embodiment, the water to be treated is oil mixed water. By treating the water to be treated with the activated carbon packed tower 1, the oil contained in the water to be treated is adsorbed and removed. Although it is not specifically limited as oil mixed water, For example, it is the water phase discharged | emitted from the solvent extraction apparatus. This aqueous phase contains a small amount of oil (organic solvent) that has not been separated by the solvent extraction device. By passing this aqueous phase through the activated carbon packed tower 1, fine oil droplets and water-soluble oil contained in the aqueous phase are adsorbed and removed.

つぎに、活性炭充填塔１の通常の処理とともに、メンテナンス方法を説明する。
（１）通水処理工程
まず、被処理水を供給口１２から供給して活性炭充填塔１に通液する。この通液処理により、被処理水は活性炭層１１において活性炭と接触し、被処理水に含まれる油分が活性炭に吸着される。油分が除去された処理後水は排出口１３から排出される。 Next, a maintenance method will be described together with normal processing of the activated carbon packed tower 1.
(1) Water flow treatment step First, water to be treated is supplied from the supply port 12 and passed through the activated carbon packed tower 1. By this liquid passing treatment, the water to be treated comes into contact with the activated carbon in the activated carbon layer 11, and the oil contained in the water to be treated is adsorbed by the activated carbon. The treated water from which the oil has been removed is discharged from the discharge port 13.

（２）定期洗浄工程
所定時間の通水処理の後、定期洗浄を行う。被処理水に懸濁物質が含まれている場合、通水処理を所定時間継続すると、活性炭層１１に懸濁物質が蓄積して、活性炭層１１が目詰まりする。定期洗浄は懸濁物質の蓄積による活性炭層１１の目詰りを防止することを目的としている。 (2) Regular cleaning process After regular water treatment for a predetermined time, regular cleaning is performed. In the case where suspended water is contained in the water to be treated, if the water flow treatment is continued for a predetermined time, the suspended material accumulates in the activated carbon layer 11 and the activated carbon layer 11 is clogged. The periodic cleaning is intended to prevent clogging of the activated carbon layer 11 due to accumulation of suspended substances.

定期洗浄は逆洗処理により行われる。逆洗処理では、洗浄水が排出口１３から供給され、活性炭層１１を逆流することで活性炭が流動洗浄され、洗浄廃水が供給口１２から排出される。ここで、洗浄水は常温である。「常温」とは特に加熱も冷却もしていない温度であり、例えば５〜３５℃である。また、洗浄水の供給流量は８０〜１２０Ｌ／分であることが好ましく、処理時間は１０〜２０分であることが好ましい。   Regular cleaning is performed by backwashing. In the backwash process, washing water is supplied from the discharge port 13, and the activated carbon is fluidly washed by flowing back the activated carbon layer 11, and washing waste water is discharged from the supply port 12. Here, the washing water is at room temperature. “Normal temperature” is a temperature at which neither heating nor cooling is performed, for example, 5 to 35 ° C. Moreover, it is preferable that the supply flow rate of washing water is 80-120 L / min, and it is preferable that processing time is 10-20 minutes.

活性炭充填塔１の通常の処理では、以上の通水処理工程と定期洗浄工程とを繰り返し行う。その頻度は、例えば１回／５日程度である。活性炭には寿命があり、油分を吸着しつづけると吸着能力が低下する。その寿命は通常１年以上であり、活性炭の吸着能力が低下した場合には、活性炭を新しいものに交換して、吸着能力を回復させるメンテナンス作業が行われる。   In the normal treatment of the activated carbon packed tower 1, the above water flow treatment step and the regular cleaning step are repeated. The frequency is, for example, about once every 5 days. Activated carbon has a lifetime, and if it continues to adsorb oil, the adsorption capacity will decrease. The service life is usually one year or longer, and when the adsorption capacity of the activated carbon is reduced, maintenance work is performed to replace the activated carbon with a new one and restore the adsorption capacity.

以上の通り、定期洗浄は懸濁物質の蓄積による活性炭層１１の目詰りを防止できればよいので、上記程度の条件で洗浄水が通水される。しかし、メンテナンス作業において活性炭充填塔１から活性炭を全量抜き出すには、後述の温水洗浄が必要となる。定期洗浄と温水洗浄の通水条件は大幅に異なっている。定期洗浄した直後に温水洗浄を行ってもよいし、温水洗浄の直前の定期洗浄を省略してもよい。   As described above, the periodic cleaning only needs to prevent clogging of the activated carbon layer 11 due to the accumulation of suspended solids, so that the cleaning water is passed under the above conditions. However, in order to extract the entire amount of activated carbon from the activated carbon packed tower 1 in maintenance work, hot water cleaning described later is required. The water flow conditions for regular cleaning and hot water cleaning are significantly different. The warm water cleaning may be performed immediately after the regular cleaning, or the regular cleaning just before the warm water cleaning may be omitted.

（３）温水洗浄工程
温水洗浄の頻度は、例えば１回／年程度である。温水洗浄は吸着能力が低下した活性炭を抜き出すために行われる。その詳細は以下のとおりである。
まず、活性炭充填塔１に温水を通液して活性炭を洗浄する。温水洗浄は活性炭に吸着された油分の粘度を低下させて、活性炭の流動性を高くすることを目的としている。温水洗浄は、温水を供給口１２から供給し、温水を活性炭層１１に通液し、廃水を排出口１３から排出することで行われる。粘度が低下した油分の一部は廃水とともに排出口１３から排出される。なお、逆洗処理と同様に、温水を排出口１３から供給し、供給口１２から排出してもよい。 (3) Warm water washing process The frequency of warm water washing is about once / year, for example. Hot water washing is performed to extract activated carbon having a reduced adsorption capacity. The details are as follows.
First, warm water is passed through the activated carbon packed tower 1 to wash the activated carbon. The purpose of the hot water cleaning is to increase the fluidity of the activated carbon by reducing the viscosity of the oil adsorbed on the activated carbon. The warm water cleaning is performed by supplying warm water from the supply port 12, passing the warm water through the activated carbon layer 11, and discharging waste water from the discharge port 13. A part of the oil whose viscosity has been reduced is discharged from the discharge port 13 together with the waste water. In addition, similarly to the backwash process, warm water may be supplied from the discharge port 13 and discharged from the supply port 12.

温水の温度は、活性炭に吸着された油分の粘度が低下する温度であればよく、例えば６０℃以上である。活性炭充填塔１がＦＲＰライニング施工である場合、耐熱性の観点から、温水の温度は１００℃以下が好ましい。   The temperature of warm water should just be the temperature which the viscosity of the oil component adsorbed by activated carbon falls, for example, is 60 degreeC or more. When the activated carbon packed tower 1 is FRP lining construction, the temperature of hot water is preferably 100 ° C. or less from the viewpoint of heat resistance.

温水の供給流量は１５〜２５Ｌ／分が好ましい。温水の供給流量が１５Ｌ／分以上であれば、活性炭を十分に洗浄できる。また、温水の供給流量が２５Ｌ／分以下であれば、活性炭充填塔１の上部から温水が溢れ出る恐れがない。また、処理時間は１６０〜２００分であることが好ましい。   The supply flow rate of warm water is preferably 15 to 25 L / min. If the hot water supply flow rate is 15 L / min or more, the activated carbon can be sufficiently washed. Moreover, if the supply flow rate of warm water is 25 L / min or less, there is no possibility that the warm water overflows from the upper part of the activated carbon packed tower 1. Moreover, it is preferable that processing time is 160 to 200 minutes.

活性炭に吸着された油分を十分に洗い流すため、また、活性炭をほぐすために、洗浄中に活性炭層１１にある程度の撹拌を加えることが効果的である。活性炭層１１を撹拌する方法としてはエア撹拌が好ましい。具体的には、エア供給用のホースを活性炭充填塔１の排出口１３から挿入し、活性炭層１１にエアを供給する。活性炭層１１を上昇する泡により活性炭が撹拌される。活性炭層１１に供給するエアは温水と同じ温度まで昇温しておくことが好ましい。そうすれば、温水の温度を低下させないようにすることができる。   In order to sufficiently wash away the oil adsorbed on the activated carbon and to loosen the activated carbon, it is effective to add a certain amount of stirring to the activated carbon layer 11 during the washing. As a method of stirring the activated carbon layer 11, air stirring is preferable. Specifically, a hose for supplying air is inserted from the discharge port 13 of the activated carbon packed tower 1 to supply air to the activated carbon layer 11. The activated carbon is stirred by the bubbles rising up the activated carbon layer 11. The air supplied to the activated carbon layer 11 is preferably heated to the same temperature as the hot water. By doing so, it is possible to prevent the temperature of the hot water from decreasing.

（４）抜出工程
温水洗浄工程の後に、活性炭充填塔１から活性炭を抜き出す。活性炭は活性炭抜出口１５から抜き出すことができる。 (4) Extraction process Activated carbon is extracted from the activated carbon packed tower 1 after the warm water washing process. Activated carbon can be extracted from the activated carbon outlet 15.

温水洗浄工程において活性炭を温水で洗浄することで、活性炭に吸着された油分の粘度が低下し、活性炭の流動性が高くなる。そのため、活性炭の抜き出しに要する時間を短縮できる。具体的には、温水洗浄工程を経ない場合、活性炭の抜き出しに要する時間が６〜１２時間、ひどい場合には一日であったところ、温水洗浄工程を経た場合は数分で活性炭の抜き出しができる。温水洗浄に要する時間を考慮しても、約３時間で活性炭の抜き出しができる。   By washing the activated carbon with warm water in the warm water washing step, the viscosity of the oil adsorbed on the activated carbon decreases, and the fluidity of the activated carbon increases. Therefore, the time required for extracting activated carbon can be shortened. Specifically, when the hot water washing process is not performed, the time required for extracting the activated carbon is 6 to 12 hours, and when it is severe, it is one day. it can. Considering the time required for hot water cleaning, the activated carbon can be extracted in about 3 hours.

（５）充填工程
全ての活性炭が抜き出された後に、活性炭充填塔１に新規の活性炭を充填する。活性炭は活性炭投入口１４から投入される。 (5) Packing process After all the activated carbon is extracted, the activated carbon packed tower 1 is filled with new activated carbon. Activated carbon is introduced from the activated carbon inlet 14.

以上のメンテナンス作業が終了した後は、再び通水処理工程と定期洗浄工程とが行われる。   After the above maintenance work is completed, the water flow treatment process and the regular cleaning process are performed again.

つぎに、実施例を説明する。
（共通の条件）
活性炭充填塔の容量は２．５ｍ3であり、活性炭層の容量は２．４ｍ3である。 Next, examples will be described.
(Common conditions)
The capacity of the activated carbon packed tower is 2.5 m 3 , and the capacity of the activated carbon layer is 2.4 m 3 .

（実施例１）
活性炭の交換時期に至った活性炭充填塔に対して、温水洗浄を行った後に、活性炭の抜き出しを行った。温水洗浄の条件は以下の通りである。温水を活性炭充填塔の供給口から供給し、排出口から排出した。温水の温度は６０℃である。温水の供給流量は２０Ｌ／分である。処理時間は１８０分である。 Example 1
The activated carbon packed tower which reached the replacement time of the activated carbon was washed with warm water, and then the activated carbon was extracted. The conditions for hot water cleaning are as follows. Hot water was supplied from the supply port of the activated carbon packed tower and discharged from the discharge port. The temperature of the hot water is 60 ° C. The hot water supply flow rate is 20 L / min. The processing time is 180 minutes.

その結果、活性炭の抜き出しは数分で完了した。温水洗浄の時間を考慮しても約３時間で作業が完了した。   As a result, extraction of activated carbon was completed in a few minutes. The work was completed in about 3 hours even considering the warm water washing time.

（比較例１）
活性炭の交換時期に至った活性炭充填塔に対して、温水洗浄を行わずに、活性炭の抜き出しを行った。活性炭の抜き出しの直前には定期洗浄が行われている。定期洗浄の条件は以下の通りである。洗浄水を活性炭充填塔の排出口から供給し、供給口から排出した。洗浄水の温度は２０℃である。洗浄水の供給流量は１００Ｌ／分である。処理時間は１５分である。 (Comparative Example 1)
The activated carbon was extracted from the activated carbon packed tower that had reached the time for replacement of the activated carbon without washing with hot water. Periodic cleaning is performed just before the activated carbon is extracted. The conditions for regular cleaning are as follows. Washing water was supplied from the discharge port of the activated carbon packed tower and discharged from the supply port. The temperature of the washing water is 20 ° C. The supply flow rate of the washing water is 100 L / min. Processing time is 15 minutes.

その結果、活性炭の抜き出し作業に１０時間を要した。
以上より、活性炭の抜き出しの前に温水洗浄を行えば、活性炭の抜き出しに要する時間を短縮できることが確認された。 As a result, it took 10 hours to extract the activated carbon.
From the above, it was confirmed that the time required for extracting activated carbon can be shortened by washing with warm water before extracting activated carbon.

１ 活性炭充填塔
１１ 活性炭層
１２ 供給口
１３ 排出口
１４ 活性炭投入口
１５ 活性炭抜出口 1 activated carbon packed tower 11 activated carbon layer 12 supply port 13 discharge port 14 activated carbon inlet 15 activated carbon outlet

Claims (2)

被処理水に含まれる油分を吸着する活性炭充填塔のメンテナンス方法であって、
前記活性炭充填塔に温水を通液して活性炭を洗浄する温水洗浄工程と、
前記温水洗浄工程の後に、前記活性炭充填塔から活性炭を抜き出す抜出工程と、を備える
ことを特徴とする活性炭充填塔のメンテナンス方法。 A maintenance method for an activated carbon packed tower that adsorbs oil contained in water to be treated,
A warm water washing step of washing the activated carbon by passing warm water through the activated carbon packed tower;
A maintenance method for an activated carbon packed tower, comprising: an extraction process for extracting activated carbon from the activated carbon packed tower after the warm water washing process. 前記温水の温度は、活性炭に吸着された油分の粘度が低下する温度である
ことを特徴とする請求項１記載の活性炭充填塔のメンテナンス方法。 2. The maintenance method for an activated carbon packed tower according to claim 1, wherein the temperature of the hot water is a temperature at which the viscosity of the oil adsorbed on the activated carbon decreases.
JP2015220266A 2015-11-10 2015-11-10 Maintenance method for activated carbon packed tower Expired - Fee Related JP6358232B2 (en)

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Citations (7)

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JPS52117881A (en) * 1976-03-31 1977-10-03 Nippon Carbon Co Ltd Method and device for desorbing active carbon
JP2000225390A (en) * 1999-02-04 2000-08-15 Japan Organo Co Ltd Filter apparatus
JP2007130585A (en) * 2005-11-11 2007-05-31 Koyo Giken:Kk Activated carbon adsorption system
JP2007216166A (en) * 2006-02-17 2007-08-30 Nippon Oil Corp Method for regenerating carbon type oil adsorbent
JP2007330905A (en) * 2006-06-15 2007-12-27 Nippon Petroleum Refining Co Ltd Oil adsorbent and purification method for oil-contaminated groundwater
JP2009172486A (en) * 2008-01-22 2009-08-06 Nippon Oil Corp Wastewater treatment apparatus
US20100298116A1 (en) * 2007-07-27 2010-11-25 Nippon Oil Corporation Method of regenerating carbonaceous oil adsorbent

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52117881A (en) * 1976-03-31 1977-10-03 Nippon Carbon Co Ltd Method and device for desorbing active carbon
JP2000225390A (en) * 1999-02-04 2000-08-15 Japan Organo Co Ltd Filter apparatus
JP2007130585A (en) * 2005-11-11 2007-05-31 Koyo Giken:Kk Activated carbon adsorption system
JP2007216166A (en) * 2006-02-17 2007-08-30 Nippon Oil Corp Method for regenerating carbon type oil adsorbent
JP2007330905A (en) * 2006-06-15 2007-12-27 Nippon Petroleum Refining Co Ltd Oil adsorbent and purification method for oil-contaminated groundwater
US20100298116A1 (en) * 2007-07-27 2010-11-25 Nippon Oil Corporation Method of regenerating carbonaceous oil adsorbent
JP2009172486A (en) * 2008-01-22 2009-08-06 Nippon Oil Corp Wastewater treatment apparatus

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